you'll hear the temptations, the four tops, the supremes, and smokey robinson. >> ♪ if you look closerboy oh, my little soldier boy ♪ >> ♪ what the world needs now is love, sweet love ♪ it's the only thing that there is just too little of ♪ >> ♪ how can i be sure in a world that's constantly changing ♪ gary: you know, mary, we were pretty open-minded about how we looked at the world and relationships. mary: that's right. and those thoughts were expressed in some great songs. >> ♪ we'll sing in the sunshine we'll laugh every day ♪ >> ♪ all i really want to do is baby, be friends with you ♪ >> ♪ there is someone walking behind you turn around, look at me ♪ >> ♪ you made me leave my happy home ♪ mary: we were saying "i love you" in brand-new ways. >> ♪ each night before you go to bed, my baby whisper a little prayer for me, my baby ♪ >> ♪ i still need you there beside me no matter what i do for i know i'll never find another you ♪ >> ♪ just call me angel of the morning angel, just touch my cheek before you leave me, baby ♪ gary: and some of the era's most passionate love songs came from t